Bryant Air Handling Units 524J - Manual (Page 11)

11
Unit Isolation — Where extremely quiet operation is
essential, install isolators between floor and base of unit, or
between ceiling and top section of unit.
Be sure that unit is level and adequately supported. Use
channels at front and sides of unit for reference points when
leveling.
Refrigerant Piping Access — The 524J Series units
come with standard knockouts for refrigerant piping. These
knockouts are located on both sides of the unit for installation
flexibility. The standard knockouts provide sufficient access to
the unit’s coils for all 524J*07A, 08A, 12A, 14A and 16A units
as well as the 524J*07H, 08H, 12H units. See Fig. 7 for the
positions. Recommended access hole use is also listed for all
units. Note that Fig. 7 shows the access holes on the control-
box side of the unit; this is the side of the unit with the coil
headers, so it is used most often for piping access.
Refrigerant Piping — See Tables 1A – 1D for refriger-
ant pipe connection sizes. For ease in brazing, it is recommend-
ed that all internal solder joints be made before unit is placed in
final position.
The 524J direct-expansion units have internal
factory-installed thermostatic expansion valves (TXVs),
distributors, and nozzles for use with R-410A. See Table 2
for part numbers. Knockouts are provided in the unit corner
posts for 524J refrigerant piping. See Fig. 7, which also lists
recommended knockouts and access holes to use for each
524J unit size. Recommended fittings are listed in Table 3.
The sensor bulb capillary tubes must be routed from the TXVs
inside the unit through one of the piping access holes. Clamp
the TXV sensor bulb on a vertical portion of the suction line,
outside the unit. See Fig. 8.
NOTE: Be sure to remove the styrofoam shipping pad from
the TXV. Verify that it has been removed. See Fig. 4.
The 524J Series evaporator coils have a face-split design.
Ensure that lower circuit of coil is first on/last off when
connected to the condensing unit and/or system controls. See
Fig. 8.
External TXV equalizer connections are provided and
factory-brazed into the coil suction manifolds.
If suction line must be horizontal, clamp bulb to suction line at
least 45 degrees above bottom, at approximately the 4 o’clock
or 8 o’clock position. See Fig. 9.
Fig. 7 — Refrigerant Piping Access Holes
IMPORTANT: Do not bury refrigerant piping underground.
IMPORTANT: Never attach the sensor to the suction
manifold. Do NOT mount the sensor on a trapped portion
of the suction line.
4
3
2
1
UNIT
USE HOLE
NUMBERS
524J*07A, 08A
524J*07H, 08H
1, 3
524J*12A, 14A, 16A
524J*12H
1, 2, 3, 4